Yea I’m pretty sure your answer is A
Pearl Harbor. The atomic bombs that we dropped on Japan was revenge for Pearl Harbor. We already had some issues with Japan but the surprise attack on Pearl Harbor was the main reason for the atomic bombs that President Truman dropped on Japan.
The Stock Market crashed <span>in America on October of 1929.</span>
Leader Nikita Khrushchev said the quote above.
I hope this answer was helpful!! :)